Tracking the calcium-magnesium-alumino-silicate (CMAS) infiltration into an air-plasma spray thermal barrier coating using X-ray imaging

Xun Zhang; Xiao Shan; Philip J. Withers; Xiaofeng Zhao; Ping Xiao

doi:10.1016/j.scriptamat.2019.09.016

Tracking the calcium-magnesium-alumino-silicate (CMAS) infiltration into an air-plasma spray thermal barrier coating using X-ray imaging

Xun Zhang
, Xiao Shan
, Philip J. Withers
, Xiaofeng Zhao
, Ping Xiao

Research output: Contribution to journal › Article › Research › peer-review

27 Citations (Scopus)

Abstract

The progressive infiltration of a free-standing air plasma spray (APS) thermal barrier coating (TBC) by calcium-magnesium-alumino-silicate (CMAS) at 1250 °C is followed non-destructively by time-lapse X-ray micro-computed tomography (µ-CT). The top ∼50 µm of the TBC expands rapidly (within the first 20 min) by as much as 70% due to the physical ingress of the CMAS along the splat boundaries and becomes exfoliated. The ingress and resulting exfoliation are shown to be driven by capillary forces with the exfoliated depth dependent on the CMAS loading. The remainder of the TBC swells at a slower rate (ultimately by 15%) but remains intact.

Original language	English
Pages (from-to)	94-98
Number of pages	5
Journal	Scripta Materialia
Volume	176
DOIs	https://doi.org/10.1016/j.scriptamat.2019.09.016
Publication status	Published - Feb 2020
Externally published	Yes

Keywords

Aero engine
Correlative microscopy
Failure
High temperature
Volcanic ash

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10.1016/j.scriptamat.2019.09.016

Cite this

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title = "Tracking the calcium-magnesium-alumino-silicate (CMAS) infiltration into an air-plasma spray thermal barrier coating using X-ray imaging",

abstract = "The progressive infiltration of a free-standing air plasma spray (APS) thermal barrier coating (TBC) by calcium-magnesium-alumino-silicate (CMAS) at 1250 °C is followed non-destructively by time-lapse X-ray micro-computed tomography (µ-CT). The top ∼50 µm of the TBC expands rapidly (within the first 20 min) by as much as 70\% due to the physical ingress of the CMAS along the splat boundaries and becomes exfoliated. The ingress and resulting exfoliation are shown to be driven by capillary forces with the exfoliated depth dependent on the CMAS loading. The remainder of the TBC swells at a slower rate (ultimately by 15\%) but remains intact.",

keywords = "Aero engine, Correlative microscopy, Failure, High temperature, Volcanic ash",

author = "Xun Zhang and Xiao Shan and Withers, \{Philip J.\} and Xiaofeng Zhao and Ping Xiao",

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doi = "10.1016/j.scriptamat.2019.09.016",

language = "English",

volume = "176",

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AU - Zhang, Xun

AU - Shan, Xiao

AU - Withers, Philip J.

AU - Zhao, Xiaofeng

AU - Xiao, Ping

PY - 2020/2

Y1 - 2020/2

N2 - The progressive infiltration of a free-standing air plasma spray (APS) thermal barrier coating (TBC) by calcium-magnesium-alumino-silicate (CMAS) at 1250 °C is followed non-destructively by time-lapse X-ray micro-computed tomography (µ-CT). The top ∼50 µm of the TBC expands rapidly (within the first 20 min) by as much as 70% due to the physical ingress of the CMAS along the splat boundaries and becomes exfoliated. The ingress and resulting exfoliation are shown to be driven by capillary forces with the exfoliated depth dependent on the CMAS loading. The remainder of the TBC swells at a slower rate (ultimately by 15%) but remains intact.

AB - The progressive infiltration of a free-standing air plasma spray (APS) thermal barrier coating (TBC) by calcium-magnesium-alumino-silicate (CMAS) at 1250 °C is followed non-destructively by time-lapse X-ray micro-computed tomography (µ-CT). The top ∼50 µm of the TBC expands rapidly (within the first 20 min) by as much as 70% due to the physical ingress of the CMAS along the splat boundaries and becomes exfoliated. The ingress and resulting exfoliation are shown to be driven by capillary forces with the exfoliated depth dependent on the CMAS loading. The remainder of the TBC swells at a slower rate (ultimately by 15%) but remains intact.

KW - Aero engine

KW - Correlative microscopy

KW - Failure

KW - High temperature

KW - Volcanic ash

UR - https://www.scopus.com/pages/publications/85072983985

U2 - 10.1016/j.scriptamat.2019.09.016

DO - 10.1016/j.scriptamat.2019.09.016

M3 - Article

AN - SCOPUS:85072983985

SN - 1359-6462

VL - 176

SP - 94

EP - 98

JO - Scripta Materialia

JF - Scripta Materialia

ER -

Tracking the calcium-magnesium-alumino-silicate (CMAS) infiltration into an air-plasma spray thermal barrier coating using X-ray imaging

Abstract

Keywords

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